package com.netty.dubborpc.netty;



import io.netty.bootstrap.Bootstrap;
import io.netty.channel.*;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.Proxy;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class NettyClient {

    //创建线程池
    private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
    private static NettyClientHander client;
    private int count;
    //编写方法使用代理模式，获取一个代理对象
    public Object getBean(final Class<?> serverClass, final String providerName){
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(),new Class<?>[]{serverClass}
        ,(proxy, method, args)->{
                    System.out.println("(proxy, method, args) 进入...." + (++count) + " 次");//会累加表示每次都会创建一个代理对象
                    //{}  部分的代码，客户端每调用一次 hello, 就会进入到该代码
                    if (client == null) {
                        initClient();
                    }
                    //设置要发给服务器端的信息
                    //providerName 协议头 args[0] 就是客户端调用api hello(???), 参数
                    client.setPara(providerName + args[0]);
                    //
                    return executor.submit(client).get();
                });
    }
    //初始化客户端
    private void initClient(){
        client = new NettyClientHander();
        //创建循环组
        EventLoopGroup group = new NioEventLoopGroup();
        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY,true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    @Override
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
                        pipeline.addLast(new StringEncoder());
                        pipeline.addLast(new StringDecoder());
                        pipeline.addLast(client);
                    }
                });
        try{
            ChannelFuture channelFuture = bootstrap.connect("127.0.0.1", 7000).sync();
        }catch (Exception e){
            e.printStackTrace();
        }
    }
}
